Novak Djokovic: Wimbledon champion, gluten free, probably not a coeliac

New men’s number one and Wimbledon champion Novak Djokovic has lost one match this year, in the French Open semi final, to Roger Federer. He has won his other fifty matches, including two grand slam finals. In April at the Serbia Open, still unbeaten for the season, he explained to the press that he had been gluten free since late 2010, a diet to which he attributed his extraordinary run of success, and for which he had a new health advisor to thank. A Reuters report of it quotes Djokovic thus: “His name is Igor Cetojevic, he is a nutritionist and he’s done a great job in changing my diet after we established I am allergic to some food ingredients like gluten.”

That is just about the only informative quote from Djokovic about his diet I can find, and there are several important points to note about it.

1. There was no mention of coeliac disease.
2. ‘Allergy’ to gluten is not coeliac disease.
3. Nutritionists have many abilities, but the means to confidently diagnose coeliac disease is not one of them.
4. ‘Some food ingredients’ – clearly there have been other dietary changes made, as well as gluten.

Naturally, this news spread rapidly and there followed the usual articles speculating over the benefits of a gluten-free diet to health and weight loss and fitness. The first specific and official mention of coeliac disease I have been able to find came in this article in the Independent from mid May, which repeats the quote from the Reuters report, but appears to leap to the conclusion of a coeliac diagnosis without offering further supporting evidence.

Since then, there has been much conversation and speculation online, including on chat forums and on blogs and in a gluten-free manufacturer’s newsletter and this morning on Coeliac UK’s FB page. Twitter has seen a lot of action, and many coeliacs have understandably expressed excitement and pride. There was a sweet tweet from a mum of a coeliac boy who was delighted she could now point to such a positive sporting role model.

But let’s rewind a little. Who is nutritionist Igor Cetojevic? I Googled him and found him here. He appears to be an advocate of ‘Energetic Medicine’, and to hold practices which orthodox medics consider unsubstantiated, such as homeopathy, magnetotherapy and Bach flower remedies, in high regard.

Of more relevance to the issue at hand, he says he uses a system called SCIO – which stands for “Scientific Consciousness Interface Operations System”. The official SCIO website can tell you more about it. Sample extract from that site: “The SCIO is a universal electrophysiological biofeedback system. It coordinates a complex electro-modal, biofeedback program with computer software in order to gather bioenergetic information of a client’s subconscious.”

At this point my internal alarm system is ringing loudly. I found this interview on a Spanish site called Quantum Medicine which appears to confirm that Cetojevic uses the SCIO to help identify ‘stress factors such as allergens, toxins, pathogens, viruses, mental and emotional disturbances…’ and implies that this is what was used on Djokovic.

What evidence do we have that SCIO is a valid tool? I cannot find one reference to it on PubMed – the online database of all published medical studies – which indicates it has probably not undergone any rigorous testing. This is hardly surprising, as it appears to be founded on a system of thinking which sits outside the medical orthodoxy.

I have found some references to it on sceptical scientific sites, however. Dr Stephen Barrett’s Quackwatch demolishes it and other ‘electrodiagnostic’ devices here and here, while Dr Ben Goldacre’s Bad Science blogpost of three years ago on the subject may also be of interest if you wish to learn more.

Their conclusion, essentially, is that the system has no foundation in science.

Where does this leave us?
Getting answers from the internet alone is, I admit, an unsatisfactory means of bringing us towards the truth, but it doesn’t alter the fact that I have been unable to find any reports that Djokovic underwent an endoscopy to confirm coeliac disease, or that he undertook an exclusion and reintroduction diet, which might help diagnose a non-coeliac gluten intolerance. I hate to draw a conclusion from what I’ve read on some, let’s say, unusual internet sites, but until we learn more, and from the information out there, it seems logical to reason that Djokovic was diagnosed with an ‘allergy to gluten’ by an alternative practitioner who uses a system which is at best scientifically questionable.

That Djokovic attributes his success to his gluten free diet cannot be argued with, but improvement in health following gluten exclusion does not necessarily imply any form of gluten sensitivity, as I have explained previously on this blog. Although I am not for one second questioning his honesty, he could be making the common but mistaken assumption that it does. In fact, there could be many possibilities for health improvement following gluten removal:

* psychological benefit, one mentioned in this Wall Street Journal article;
* benefit due simply to an improvement in diet that often comes with the elimination of the junk food gluten is typically found in, rather than a removal of the gluten itself;
* benefit from ingredients other than gluten which have been removed from the diet as a consequence of gluten removal, for instance bread yeast;
* benefit from the weight loss which can occur (and which occurred in Djokovic’s case);
* benefit derived from the replacement foods (and their nutrients) introduced into the diet to compensate for the removed gluten-containing foods.

I do understand why coeliacs and gluten sensitives have leaped on this story and looked to pop Djokovic on a gluten-free pedestal as the most famous coeliac on the planet. And while I cannot be 100% certain given the lack of reliably sourced information, I suspect he is not a coeliac, and I am personally not confident in any diagnosis of ‘gluten allergy’ or other gluten sensitivity either.

There are lots of reasons to like Djokovic: he’s a magnificent champion and athlete, he is talented and great to watch on court, he’s personable and he’s really very funny – as his notorious tennis impersonations testify. But perhaps the ability – or not – of his intestines to properly handle wheat protein should not be one of them.


  1. DavidJ_GF

    I completely agree. So many Coeliacs, Coeliacs groups, families and Gluten Free manufactures have jumped on his band wagon. But he doesnt seem interested in driving it.

    On the recent BBC Wimbledon coverage, the build up before tge mens final. He very quickly glossed over his Gluten Free diet, when questioned on it. He seems now reluctant to cotribute his success to that alone, rightly so as your blog explains. Believe hes not interested in being a Coeliac figure head. Perhaps hes had much unwanted attention from Coeliacs the world over. Think we should be careful… he wont fly the flag for Coeliacs. Not sure yet if all this will help or hinder Coeliac awareness.

    But his tennis and achievements are just amazing. A very likable guy and great to watch. Full respect to him.

  2. Sarah Hilleary

    What he is unintentionally doing is raising awareness of the gluten free lifestyle and the choices available. I don't see that as a bad thing. So many people are not diagnosed, so if this is raised to people's awareness then more people will get tested, more companies will provide gluten free products. Btw Coeliac NZ recognises gluten sensitivity these days. You may have noticed and blogged about it (but I'm a newbie to your blog) so apologies if I missed it !

  3. Alex G

    @ David – I missed that interview where he was reluctant to comment. Will see if I can find it on the Wimbledon site.

    @ Sarah – Yes, there's the point that more people will get tested (good), but on the flip side, some could start an experimental GF diet without knowing what they're doing (bad). A dietitian's advice is key. It's easy to miss 'hidden' gluten, and cutting it out prior to testing hampers diagnosis in a genuine coeliac case. Re: non-coeliac gluten sensitivity, yes, beginning to get recognised, I agree. I'm not denying its existance at all – just raising the possibility that Djokovic has neither condition.

    Thanks both for commenting – much appreciated.

  4. Anonymous

    The most sensible article about Djokovic's gluten free diet available. THANK YOU, you have restored my faith in humankind. (I was absolutly agast when I read that the Independent labelled him coeliac – how irresponsible can the press be!?)

  5. Alex G

    Thanks very much. I suspect it was just ignorance and lack of fact-checking as opposed to irresponsible… as a freelance member of the press, I know that mistakes can be made, despite the best of intentions, and it would be difficult to issue a correction on this matter because the issue still remains unclear and uncertain – ie, Djokovic hasn't confirmed or denied, either way, at least to the best of my knowledge.

    Really appreciate the comment.


  6. Anonymous

    It says his doctor is also an MD

  7. Alex G

    Not sure where / what you're referring to, sorry.

  8. Anonymous

    "Yes, there's the point that more people will get tested (good), but on the flip side, some could start an experimental GF diet without knowing what they're doing (bad). "

    Correct. Trying a GF diet limits the chances of correct diagnosis of coeliac disease later on, as we found out after one of my children was correctly diagnosed and we foolishly placed our other children on GF diets "just in case"

    I came across this blog today as Andy Murray has publicly stated that his GF diet trial was not beneficial, apparently the opposite. Hopefully this will discourage people from trying expensive faddy diets just because their favourite celebrity says it works.

    I recall Novak Djokovic's switch to GF followed a year (2010?)of dropping out of tournaments, often mid-match, with stomach problems. Clearly he needed to act on that and whatever he did has worked as he has been world no 1 for over a year now. I don't recall Andy Murray having any similar problems, so maybe his advisers were just jumping on a bandwagon, which he has now jumped off.

  9. Alex G

    Thanks for commenting – especially on such an old post. Curiously it always starts attracting more hits around tennis season! I hadn't realised Murray had admitted his GF diet hadn't helped him – I'll look into it, thanks – and maybe indeed it'll be a sobering anecdote to others thinking about going on the diet experimentally.

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